Abrading tool



J. PAvLovlc ABRADING TOOL Jul 14, 1953 Filed March 28, 1952 F/Gf ZPatented July 14, 1953 UNITED STATES PATENT- QFFICE V ABRADING TOOL UJoseph Pavlovic, Minneapolis, Minn.

' I Application March 28, 1952, SerialNo. 279,016

This invention relates to abrading tools. More particularly, it relatesto abrading tools of the type wherein an abrasive sheet is removablyat-.

tached to a supporting surface, of the tool to facilitate the abradingoperation.

This invention is an improvement on the abradingtool disclosed andclaimed in my prior patent, No. 2,415,367, entitled Abrading Tools, andissued to me February 4, 1947. Although the abrading tool disclosed andclaimed in my prior patent has proved highly satisfactory, I have sinceconceived of a structure which constitutes a still further improvementvin such a tool.

It is a general object of my invention to provide a novel and improvedabrading tool.

A more specific object is to provide a novel and improved abrading toolwhich will function in an improved manner and can nevertheless bemanufactured of cheap and simple construction.

A still more specific object is to provide an abrading tool constructedto facilitate the quick and easy attachment and detachment of anabrasive sheet thereto with increased security Without weakening thestructure of the sheet itself.

Another object is to provide an abrading tool having means foreffectively retaining a stack of abrasive sheets in such a way that theycan be easily applied to the tool and can quickly and easily be removedin sections as the outer sheets are worn away by use.

Still another object of the invention. is to provide an extremely simplyconstructed tool body with means for effectively securing a stack ofspecia'lly formed sheets. thereto wherein all of the sheets aresimultaneously held under tension durf ing, the abrading operation andwherein a clamping action is utilized tojfacilitate the-quick and easyremoval of a single'sheet or a plurality of such sheets.

These and other objects and advantages of my invention will more fullyappear from the following description made in connection with theaccompanying drawings, wherein like reference character's refer to thesame or similar parts throughout the several views, and in which:

Fig. 1 is a side elevational view of one embodiment of my invention withportions thereof broken away adjacent the abrasive sheet securing means;

"Fig; 2 isa front elevational view of the'same; and

Fig. 3 is a perspective view of one form of clamp which may be used-inmy invention. r One embodiment of my invention may include, as shown inFigs. i=3, an elongated sheet holding 11 Claims. (01. 51-187) body -5'which preferably is tapered toward its upper or outer end 6 and whoseouter end edge is rounded as at I as shown in Fig. 1. A handle 8 forms apart of and extends from one end of the body 5. Where the body .5 andthe handle 8 join I provide a reduced portion 9 formed by arcuatecut-outs II] to provide finger and thumb receiving seats. 1 I

The body 5 adjacent the point where it joins the handle 8 has alongitudinally extending aperture II therethrough. A rod IZextendslongitudinally through thehandle 8. The outer end of the rod I2 isprovided with a knurled head I3 and the inner end of this rod isthreaded as at [4 and extends through a clamp member indicated generallyas I5 having a threaded aperture therein.

This clamp member I5 has a pair of clamping arms I6 extending fromopposite sides thereof, first outwardly of the aperture II, and theninwardly beyond opposite sides of the supporting body 5. Each of thearms has a clamping portion I! which abuts against the sides of the bodyI 5 and each arm is formed of a resilient material such as spring metalso as to constantly urge the clamping portions II inwardly toward eachother. Formed in the opposite sides of the body 5 and opposite eachother is a pair of transversely extending recesses I8. These recesses I8are disposed adjacent to the aperture II and between that aperture andthe rounded end I of the body 5. The clamping arms I6 are of, suflicientlength so that their clamping'portions I'I'may extend into the recessesI8 when the clamp member is moved toward the rounded end I of the body5.

:In. other words, the length of the clamping arms I6 is at leastequal tothe distance between the recesses I8 and the side wall "of the apertureclosest to these recesses.

The two clamping arms I6 are connected at their inner end portions I9 bya connecting portion 20 to form the clamp member I5. This connectingportion 20 has an aperture 2| formed therein and the walls ofthe'conne-cting portion 'Which define the-aperture are internallythreaded so as to cooperate with the threads I4 at-the' rod I 2 to causethe clamp member I5 to move toward and'away from the rounded end I ofthe body 5 when the rod I2 is turned by means of the knob I3.

The clamp member I5 is so formed that the spacing between the clampingportion 11 of the respective arms I6 issubstantially equal to thethickness of the body 5 between the two opposite recesses or grooves I8.l have found that it is preferable to-have the spacing between theseclamping portions II slightly greater than the thickness of the body 5in this area so as to facilitate the ready and quick insertion orremoval of a number of abrasive sheets 22 therebetween.

In use, a plurality of abrasive sheets are placed in a stack and arebent around the end I to lie along opposite sides of the body 5 as shownin Fig. l. The knob I3 is turned so as to cause the clamp member I5 tomove toward the rounded end I until the clamping portions II of the armI6 slide into the recesses I8. The ends of the sheets 22 are then slidlaterally between the portions of the body 5 Which define the recessesI8 and the clamping portions ll of the clamping arms. When the knob I3is turned so as to draw the clamping member I5 toward the handle 8, theclamping portion I! must necessarily ride outwardly from the recesses I8and clamp the end portions of the abrasive sheets firmly against thethicker portions of the body 5 adjacent these recesses to secure thesheets in a firm and positive manner. Due to the fact that the tensionupon the clamping member is imposed at the connection portion 20, whichis the base of the clamping member I5, this pulling action tends tocause the clampingportion II to clamp the abrasive sheets 22 even moretightly than would normally be the case if the clamping member weremerely pushed toward the handle by some other means. In other words, animproved clamping action is attained through the use of thethreaded rodI2 at the base of the clampingmember. I have found that this structuresecures the abrading sheets in an improved manner and eliminates anypossibility of rendering the sheet unsatisfactory for. use as maybe thecase when the sheets are apertured and-.drawntoo tightly over the end of.the main body 5.:by providing members extending outwardly therethrough.

:Itshould be. noted that my improved abrading too-l precludesanyweakening of the abrasive sheet structure itselfso that there is nodanger whatsoevercf wasting any. ofthe abrading sheets. In addition, Ihave attained an improved securing action since theclamping action isapplied across substantiallylthe entire width of. the abrasive sheet.v..:,

By. employing the two opposite recesses I8 I have greatly facilitatedthe. mounting of a stack of abrasive sheetsupon such a tool. I find thata stack of sheets .canbe applied more quickly to such a tooland with aminimum of inconvenience. It is notimperative that each sheet in the,stack be truly aligned with the other when my improved 'abradingtooljs.used. Whenthe outer sheet has become worn the knob I3 is merelyloosenedand then pushed inwardly toward the handle whereupon theclamping portion II will againslip into the recesses. I8 and theouter-most sheet can be quickly slid therefrom. A few turns of the knobI3 again draw the clamping portions outwardly in clampingpositionagainst the sides of the main body 5.

It should be noted that the clamping member i5 is a relatively simplearticle to manufacture since it can be stamped from a single piece ofmaterial and oamtherefore be manufactured at a reduced cost.'

It will, of course, be understoodthat various changes may be made in theform, details, ar-

rangements an d;.-proportions of the various parts without departingfromthe scope of my invention. V

What is claimed-is:

l 1. In an abrading tool, an elongated body having a. continuous sheetsupporting surface extending along the opposite sides and about an endof said body, a pair of abrasive sheet engaging members projectingoutwardly from opposite sides of said body and then inwardly toward saidend of said body and adapted to engage portions of an abrasive sheetadjacent opposite ends thereof with said inwardly extending portions ofsaid members when the sheet is placed about said end and alongoppcsite'sides of the body, and means for moving at least one of saidsheet engaging members toward and away from an end of said body.

2. In an abrading tool, an elongated body having a continuous sheetsupporting surface extending along opposite sides and about an end ofthe body, a pair of clamp elements projecting outwardly from oppositesides of said body toward said end of said body and adapted to clampportions of an abrasive sheet adjacent opposite ends thereof against thesides of said body when the sheet is placed about said end and alongopposite sides of said body, and means for moving at least one of saidclamp elements toward and away from an end of said body.

3. In an abrading tool, a body having a handle thereon and having anaperture therethrough adjacent the base of said handle, an abrasivesheet clamping member located in said aperture and having portionsextending transversely outwardly therefrom at opposite sides of saidbody toward said end of said bodyand engaging the opposite sides of saidbody in clamping relation, and means for moving at least one of saidoutwardly extending portions ofsaid clamp member toward and away fromsaid end of said body.

i. In an abrading tool, a body having a handle thereon and having anaperture therethrough adjacent the base of said handle, a clamp memberlocated in said aperture and having medial portions extendingtransversely outwardly therefrom at opposite sides of said body andhaving end portions engaging opposite sides of said body to clamp aportion of an abrasive sheet against said body adjacent said aperture,and a rotary threaded element extending through said handle and threadedinto said abrasive sheet clamping memher and adapted to shift saidmember in said aperture longitudinally of said body.

5. In an abrading tool, a body having a continuous sheet supportingsurface extending along opposite sides and about an end of the body, andhaving ,a transversely extending recess formed in one of its'sides,means for securing one end portion of'an abrasive sheet against one sideof said body, a clamp element movable longitudinally of said body andextending outwardly from the other side of said body and adapted toclamp an end portion of such sheet against the opposite side ofsaid'body adjacent its recess when such sheet is placed about said'endand along opposite sides of said body and across said recess, said clamelement extending outwardly on the same side of said body as said recessand having an end portion resiliently engaging said same side of saidbody to accomplish said clamping action, and means for moving said clampelement toward and away from said recess.

6. In an abrading tool, a body having a c 3111110135 Sheet pp t gsurface extending along opposite sides and about anend of the body, saidy having a spaced pair of opposite transverse recesses formed in the'opposite sides of said b y. a pair. of clarnp elements projectingoutwardly from opposite sides of said body and toward said recesses andhaving end portions resiliently bearing against opposite sides of saidbody adjacent said recesses to positively engage an abrasive sheetadjacent opposite ends thereof when the sheet is placed about said endand along opposite sides of the body and across said recesses, and meansfor moving said clamp elements into and out of said recesses and towardand away an end of said body.

7. In an abrading tool, a body having a continuous sheet supportingsurface extending along opposite sides and about an end of the body, apair of resilient clamp elements projecting outwardly from oppositesides of said body and having portions resiliently bearing against saidopposite sides of said body to clamp portions of an abrasive sheetadjacent opposite ends thereof against the sides of said body when thesheet is placed about said end and along opposite sides of said body,said clamp elements being con-, nected together by their inner endportions, and means for threadedly mounting said clamp elements by theirconnecting portions upon said body for movement longitudinally of saidbody toward and away from an end of said body.

8. In an abrading tool, a body having a continuous sheet supportingsurface extending along opposite sides and about an end of the body, andhaving a spaced pair of opposite transversely extending recesses formedin the opposite sides thereof, a pair of abrasive sheet clamping armsprojecting outwardly and then inwardly from opposite sides of said bodyand having free end portions resiliently engaging opposite sides of saidbody to clampingly engage portions of such a sheet adjacent oppositeends thereof when the sheet is placed about said end and along oppositesides of said body and across said recesses, the spacing between theouter ends of said arms being no greater than the thickness of said bodybetween said recesses, and means for moving said end portions of saidarms toward said end of said body into said recesses and away from saidend of said body out of said recesses.

9. In an abrading tool, a body having a continuous sheet supportingsurface extending along opposite sides and about an end of the body, aclamp member mounted on said body for longitudinal movement thereof,said clamp member including a pair of clamp elements projectingoutwardly from opposite sides of said body and having free end portionsresiliently engaging opposite sides of said body at all times to clampportions of an abrasive sheet adjacent opposite ends thereof against theopposite sides of said body when the sheet is placed about said end andalong the opposite sides of said body, and mechanism for moving saidclamp member toward and away from an end of said body.

10. In an abrading tool, a'body having a handle thereon and having anaperture therethrough adjacent the base of said handle, said body havinga continuous sheet supporting surface extending along opposite sides andabout an end of the body and having a pair of opposite transverserecesses formed in the opposite'sides thereof adjacent said aperture, aclamp member located in said aperture and having a pair of clampelements extending transversely outwardly therefrom at opposite sides ofsaid body and toward said recesses, the length of said clamp elementsbeing greater than the distance between said aperture and said recesses,and means for moving said clamp member longitudinally of said body intoand out of said recesses.

11. In an a'brading tool, a body having a continuous sheet supportingsurface extending along opposite sides and about an end of the body, andhaving a spaced pair of opposite transverse recesses formed in theopposite sides of said sheet supporting surface and being separated fromeach other by a portion of said body, an abrasive.

sheet clamping member movably mounted on said body adjacent saidrecesses and having a pair of resilient clamp elements projectingoutwardly from opposite sides of said body toward said recesses and theninwardly again to clamp an abrasive sheet adjacent opposite ends thereofagainst opposite sides of said body when such sheet is placed about saidend and along opposite sides of said body and across said recess, thespacing between the clamping portions of said resilient clamp elementsunder non-clamping conditions being substantially the same as thethickness of said body between said recesses, and means for moving saidclamp member longitudinally of said body into and out of said recesses.JOSEPH PAVLOVIC.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,893,679 Quinn u Jan. 10, 1933 2,076,973 Wilson Apr. 13, 19372,189,307 Bierma Feb. 6, 1940 2,324,918 Engle July 20, 1943 2,415,367Pavlovic Feb. 4, 1947 2,464,668 Booth Mar. 15, 1949 2,481,399 GunnarsonSept. 6, 1949

